Lamtec ETAMATIC OEM - Thermostat and Control Range

60
8 Internal Burner Firing Rate Controller
8.13 Thermostat and Control Range
The thermostat function switches the burner on and off on the basis of the temperature and/
or pressure value, but only when burner is released by the start signal. The control range is
formed by entering the controller setpoint value and the parameters P 802 (switch-on point),
P803 (upper control range) and P 804 (burner OFF). The cut-off hysteresis is divided into 2
ranges. The first part lies above the setpoint and forms the upper control range. The second
part lies below the setpoint and forms the lower control range.
The control range may lie asymmetrically around the setpoint.
The power control unit functions within the upper and lower control range according to its set-
tings in the parameters and the default values.
If the actual value of the control unit reaches the shut-down range, the base firing rate request
is emitted. If the control unit’s setpoint exceed the shut-down range a control shut-off occurs.
Fig. 8-2 Startup sequence
*(1) = P 792
*(2) = P 793
Nr. FMS ETA
/FA1
Short Text Description Min Max Default
791 0 0 Anf.Temp Max. start-up temperature 0 999 0
Maximum start-up temperature or pressure in relation to
the actual value
Start - up circuit parameter:
Enter the actual temperature, up to which the start - up
circuit is active. See fig. Start - up circuit
792 0 0 Anf.Leis Start-up output 0 999 0
Burner start-up firing rate, corresponding to the internal
firing rate (in digit)
Set the firing rate value at which the burner should start.
see fig. start - up circuit
793 0 0 Anf.Zeit Start-up time 0
32767
0
Burner-start-up-time in seconds
The maximum time the start - up circuit is active is set
here.
see fig. start - up circuit